SU1245268A3 - Rotor of electrical machine with permanent-magnet excitation - Google Patents

Abstract

The rotor for a permanent magnet electric machine, without collector, comprises a given number of magnetic segments (13) held on a rotating body (12) made of soft magnetic material. The fixation of the magnetic segments (13) on the contour of the rotating body made of soft iron (12) is provided without increasing the magnetic air gap, by adhesive and/or retaining magnetisable means. Hence, the magnetic segments (13) may be either adhered on a soft iron core (12) by means of a magnetisable glue (15), or only or additionally, retained by a bandage (14) which is also impregnated with a magnetisable substance, particularly the same magnetisable glue (15).

Description

one

The invention relates to electric power machines, namely permanent magnet rotors for an electrically controlled brushless motor.

The aim of the invention is to simplify the manufacturing technology and reduce the cost of the rotor.

Fig. 1 shows a horizontal projection of a rotor equipped with a bandage; in FIG. 2, a rotor magnetized at an angle, top view; figure 3 - frequency cut of the rotor in the region of two adjacent to each other magnetic segments.

The rotor of the electric machine comprises a shaft 1 on which the carrier part 2 is fastened, made of a magnet of iron. Magnetic segments 3 are fastened around the perimeter of the magnetically soft iron carrier part 2 by means of a band 4, which can serve either as the only fastener or as an additional fastener for making the glue joint between the magnetic segments 3 and the carrier part 2. The adhesive is applied with a two-component glue, to which the powder of a permanent magnet is mixed, so that the area in which the adhesive becomes magnetized.

FIG. 2 shows a rotor without a band 4 in a special design in which the individual magnetic segments 3 without visible joints adjoin each other and are magnetized at an angle to the direction of the axis of the rotor. Different magnetic regions are designated by letters N and S in accordance with the formed north and south poles.

Between the part 2 and the magnetic segments 3, the gaps can be filled with magnetized glue 5, Also filled with magnetized glue 5 recess 6, formed at the edges of the magnets due to

chamfer 7,

I.

Thanks to the measures according to the invention, it is possible to construct a simple rotor of a high-power brushless motor with low magnetic losses. Due to the residual elasticity of the hardened adhesive 5, it is also possible

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and

245268

bridging the difference between the thermal expansion coefficients of iron and the permanent magnet material. Despite the use of bandage 4,

5, the air gap in the engine is practically not increased, because the bandage is saturated with a magnetisable glue and is magnetic conductive. It is advisable to leave to harden

 About magnetized adhesive in a radial magnetic field to achieve a certain anisotropy of the powder and thereby increase the magnitude of the magnetic flux. Thanks to this

55, the alignment of the magnetic parameters of the magnets themselves and the gluing points is achieved, thereby increasing the stopping accuracy in the feed drives. Curing magnetized adhesive

20 5 occurs in an oriented magnetic field, which is created — by simply bi-polar magnetization of the entire structure. After curing of the magnetized adhesive 5 pro 5, the final magnetization proceeds,

In brushless motors, which are necessary for drives for supplying metal-cutting machine tools and, for each of their applications, 30 seconds are required, especially insignificant moments, t, e. especially small fluctuations of the magnitude of the magnetic conductivity along the perimeter of the rotor and / or the stator. Using the proposed magnetisation at the angle of the magnetic segments, located around the perimeter of the rotor with virtually no gaps, sticking and magnetic noise of the engine are significantly reduced

40 l, since the axial gaps and the jump-like change of the magnet flux in the rotor disappear.

45

The use of magnetized glue 5 gives additional advantages

50

The fact is that in the manufacture of magnetic segments, increased tolerances can be resolved, which significantly reduces the manufacturing waste and manufacturing costs. Without such tolerances, the magnets should be manufactured with approximately zero tolerances, if they are to fit snugly around the perimeter of the part 2. In the area of the gaps 5 between the magnetic segments 3 there are also technologically driven cavities 6, both disturbances of the magnetic circuit can be eliminated adhesive 5. The body of the rotor as a whole becomes thus homogeneous and has no differences in the magnetic properties in the axial direction. If the magnetized adhesive 5 is also used to glue the magnetic egmentov 3 in item 2 of magnetizable iron, it is possible to completely avoid additional air gaps in the magnetic circuit, which leads to a substantial povsheniyu magnetic flux in the motor. Thus, the connection of the magnetic segments is simple both in design and manufacturing technology, which reduces the cost of the proposed rotor.

Claims (8)

1. A rotor of an electric mask with excitation from a permanent magnet, predominantly a brushless synchronous electric motor, in which magnetic segments are fastened externally on a rotating iron carrier with adhesive and / or retaining means, characterized in that, in order to simplify manufacturing technology and reduce rotor costs, magnetic segment adhesives and / or holding means contain magnetisable material cured in a magnetic field to achieve anisotropy. 2. The rotor is pop.1, distinguished by the fact that the magnetic segment. , 15 12452684  You are elastically fixed to the bearing part. 3. A rotor according to claims 1 and 2, which is based on the fact that the magnetic segments are wrapped with a bandage, which is impregnated with a magnetisable substance. 4, The rotor is pop. 3, different from the fact that the bandage is saturated with magnetized glue. 5. Rotor on PP.1-4.0 t of l and h and y - yi and j; the fact that the magnetic segments are attached to the iron carrier with an adhesive, mainly two-component, which is mixed with powder made from permanent magnet material. 6. A rotor according to claims 1-5, characterized in that the magnetic segments are located directly abutting each other along the entire perimeter of the iron-bearing part, and the gaps between the magnetic segments are filled with magnetized adhesive. 7. The rotor is according to claims 1-6, which is made with the fact that chamfers are made on the magnetic segments, and the recesses formed by them are filled with magnetized glue. 8. A rotor according to claims 1 to 7, characterized in that the magnetic segments directly adjoin each other. to a friend and installed around the perimeter of the supporting parts of iron, while the magnetic segments are magnetized at an angle to the direction of the axis of the rotor. Compiled B / Gregubov Editor Yu, Sereda Tehred L. Olennik Co-Director A.Obruchar Order 3929/60 Circulation 631. Subscription of the USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, R Aushska nab. 4/5 Production and printing industry, Uzhgorod, Proektna St., 4